Timing device for explosive-engines.



A. LAMONT'RL L. C.' STEBRS. TIMING DEVICE EUR EXPLOSIVE ENGINES.

APPLICATION FILED JULY 20, 1908.

Patented May 4, 1909.

INVENTORS Alexander' Lamont i C. Steer-S 0'/ /Q//l/f l ATTORNEl/,g

W1' TNESSES mit uur wur u 3,

ALEXANDER LAMONT AND LILLION C. STEERS, OF DETROIT, MICHIGAN.

TIMING DEVICE FOR EXPLOSIVE-ENGINES.

` No. 920,159. v Specification of Letters Patent. Patented May 4. 1809 3 y Application led July 20, 1908. Serial No. 444,465.

Toyqll whom 'it 'may concern.'

V eitknown that we, ALEXANDER LAMONT andLILLroN C. S'rnnns,citizens of the United States r'of America, residingat Detroit, in the county of Vllayne and State of lllichigan, have invented certain new and useful Improvements 1n Timing Devices for Explosive- Engines, of which lthe following is a specification, reference being had ltherein'to the accom anying drawings. l

...T is invention relates to timers for the ignition systems of explosive engines, and more especially to certain arrangements and provisions therein for insuring proper electrical contact between the several parts and for reventing interruption by dirt, dust and the ike, n Y The invention consists in the matters hereinafter set forth, and more particularly pointed out in the appended claims.

In the drawings, Figure 41 is a plan view with casing removed, of a timerembodying features ofthe invention. Fig'. 2 is a view thereof in vertical section. Fig. -3 is a view in detail in section on or about line :1f-.r of Fig. 2 of a .viper head and Contact roll. Fig. 4 is a view in detail ofthe roll.

Referring to the drawings, a circular base plate 1 has a central depending hub 2 in which an upright shaft 3 is rotatable, the latter being adapted to be operatively connected -in any preferred manner to thecrankshaft, cam-shaft or other like )art ofen explosive engine. A peripheral'flange 4 on the plate is exteriorly screw-threaded or other- Wise fitted for detachably engaging a cover 5. 4A bushing 6 of insulating material with inner rim 7 on its lower end, is held on the plate in the flange 4 by symmetrically disposed studs 8 each having a reduced stein 9 passing through insulating fer-rules 10, with clampingnut 11 and outer bur 12 for bindingr a terminal `Wire 13. rPhe bodies of the studs are faced ofi" flush with the interior periphery of the bushing an d forni Contactv surfaces which are swept by a roll 14. The latter is journaled between parallel lateral lugs 15 of a rock arm 16 and intermediate the ends thereof; The arm is pivoted at one end by a pin 17in a bearing slot of a head 18 adapted to be secured as by a set screw 19 on the shaft 3. A suitably disposed spring,T 2U cated in a lsocket 21 in the bottoni ofthe groove, projects the. free end of the arm and holdsthe roll inyielding contact withthe inner periphery of the bushinv. A pivot stud 22 on which the roll turns has a central duct 23 with lateral discharges 24, an oil hole 25 in the upper slot wall of the head which may be made to register with the stud duct permitting introduction of the lubricant. The roll, which may be of harde-ned metal has a series of peripheral grooves 26, either straight or the resultant ridges being sharp consequent chattering of the roll.

Another' very important feature is the design of the roll periphery. Any carbon or dirt on the bushing or contact stud faces traversed by the roll is either cut through by the projecting sharp ridges of the roll face, or they are bridged thereby, so that the roll does not jump away from the contact faces of the studs and cause injurious sparking or else interrupt the ignition circuit. Further, the slight endwise play between the parts allows the 'roll edges' to traverse a new path each revolution, thereby keeping; the surfaces of the contact studs bright.

Obviously, changes in the details of construction vmay be made without departing" from the spirit of the invention und we do not care to limit ourselves to any particulier form or arrangement of parts.

lv'bat we claim as our invention isz- 1. A timer for explosive engines compris` ingI a rotatable shaft, a base plate jodinaled thereon, a cylindrical bushing' of insulating material on the plate concentric with the shaft, studs insulated from the plate securing the bushing thereon and presenting faces flush with the-inner periphery of the bushing', a head secured on the shaft within the bushinglhaving a bearing slot in oneI side, an arm pivoted at one end in the slot, a spring' projecting the free end of the arm, a roll journaled in the arm between its ends adaptedto sweep the. inner periphery.' of the bushing, and a cover detachably secured on the plate in concentric relation to the bushing.

2. il timer for explosive engines comprising a rotatable shaft, a base plate journaled thereon, a cylindrical bushing: of insulating material on the plate concentric with the shaft, studs insulated from the plate securing` the bushing 'thereon and presenting faces flush with the inner periphery of the bushl ing, a head secured on the shaft Within the bushing having a bearing slot in one side, an arin pivoted at'one end lin the slot, a spring` projecting lthe free end vol the arm, parallel marginal flanges on the outer side of the arm, a will journaled on the arm vbetween the llanges adapted to sweep the inner peri 'hery of the bushing, and a cover detachab y secured on the plate in concentric rela` 4ion to thebushing. v

3. `A timer for explosive engines comprising a rotatable shaft, a base plate `journaled thereon, a marginal flange on the plate, a ey'-l lindrical bushing of insulating material on the plate within the flange concentric with the shaft, studs insulated from ythe plate securing the bushing thereon and presenting faces flush with the inner periphery of the.

bushing, a head secured on the shaft within the bushing having a bearing slot inone side, an arin pivoted at one end ,in the slot, a spring projectinv` the free end of the. arm,

parallel inarginaljilanges on the outerside of v the arnnna roll journaled'on the arm between the llanges adapted to'sweep the inner, periphery of the hushin and a cover detachably secured on t p ate and flange in concentric relation to 't e bushing.

, 4. A timer for explosiveenvines compris-l ing a'rotatable shaft, a base pllate journaled thereon, a cylindrical bushing of insulating material on .the plate concentric with the shaft, studs insulated from the plate securing they bushing thereon and presenting faces flush with the inner periphery of the bushing,

ing a rotatable shaft, a base p ate jornaled thereon, a cylindrical bushing of insulating material onv the. plate concentric with the shaft, studs insulated from the plate securing the' bushing thereto and resenting faces flush with the inner periphery of the bushing, a head secured on the shaft within the bushing having a bearing slot inone side, an arm ivoted at one end in the slot, a spring pro )ecting the free end of the arm, a ,bearing stud secured on the flanges parallel to they shaft and provided with an axial oil duct leading from its upper end discharging through lateral outlets, a roll journaled on the stud having circumferential grooves, and

- a cover detachablysecured on the plate over the bushing, said head having an oil feed hole in its u per side over the slot adapted to lregister wit i the roll stud duct.

ln testimony whereof weaix our signaturesin presence of two Witnesses.

' ALEXANDER LAMON T. LILLION C. STEERS. r Witnesses: v

RHEA DUNN, C. B. STICKNEY. n 

